200 4R vs 700 R4?

[72shorty]

I am slowly starting to read and get educated on these trucks and the various parts, etc. that go along with them. My question is regarding auto tranny's. A friend of mine told me about the 200 4R this weekend and while I have never heard of it, I am not educated much on tranny's period. I just assumed from reading, posts, etc that the 700 R4 was the way to go. So, does anyone have any experience with these two?

I have a '72 short step with a 250 inline six. I am considering keeping the six a while but would love to get rid of the 3spd on the column and swap for an auto but really want an overdrive as my motor screams at 60mph and above. This truck is my daily driver and I have no intentions of turning it into a hot rod or do much pulling. Some day, when I have the money, I would love a small block Chev.

Experiences and/or thoughts?

Thanks!